Threading device



sept. 3,. 1940.

J. P. BIRD ET AL THREADING DEVICE Filed Jan. 5, 1939 2 Sheets-Sheet 2INVENIORS James F. H/raf 00d mfr-ed Schaffen ATTORNEY Patentedseprjaisdc'` 2,213,379Y l.

f. fr d -z,213,379 DEVICE i.iaineeiziiimi and FrednsehaffergiiansasCity, Mo. Application January 3, 1939, Serial No."249;006`v v 13c1aims,(c1.1o-s9).j

. This invention relates tcthreadingidevices and pipe clamping member ofthe device Vn the line more Aparticularly to a device of that character-5, Fig- 3. arranged to grip the bore of a tubular member, Fig. v6 isadetailperspective View oithe mansuch as a pipe, andfrom a thread on theend of drel and clamping elements of theA device, the

5 the pipe, regardless of thelength ofgthe pipe and same being shown indisassembled spaced rela- 5 itsinsidc and outside diameters.` 1 'iOni TThe principal Object of the presenty invention Fig. 'l is 'a verticallongitudinal cross-sectionv is to provide a pipe threading devicecapable 0f *through a -modiiied form of threading device,.il`accurately, quickly and efncientiy chasing tnreads `lus'ratlniranarrangement formanually operaion the ends of pipe without 'thenecessityof sup'-A ing the device'. f y Y 10 porting the pipe ina viseor like member. Referring more in detail to the drawings:

Other important objects of the present inven- The pipe threading'deVCef-Inbodving the vfea-V tion are Vto provide a threading devicecapable of tures 0f the present"inventionl preferably., Con- Atransportto any Vplace where it is necessary to SSS 0f mandrel? Comprising apair. Of mating thread pipe and which is capable of threading ftubularmembers V3 and 4', Fig. i6, the :member 15 such pipe withoutotherfaccessories; Vto provide 4 Peinfintrengageable Withfthvmmber 3 inafor clamping the threading device in desired Vpou Suitable mannerasv'by@ threaded boss 5* on the sinon relative to the' pipe to bethreadedend iixmember 4 engageable 1n a threadid feces 5 0 ing thethreading device to the pipe itself; to prothe' mer .end .df tde.mandrel' member 3 The vide for facilitating rotating a thread-cuttingdie mandrel member s provlded Wth spaced 10d' 20* in the device relativeto the portion of the pipe to gdudmauy dxtendmg Slots. 7* Ofi a ,lfnngthand. be threaded; to provide for normally urging the width adapting themfor slidably'seatmg clampdies into cutting engagement with the pipe; toing inserts 8, the clamping inserts 8 eachbeing provide for chasingthreads on pipesof different tapredlOng-ltudmauy from a .mde Inner end 9g5 diameters with the same. thread-cutting device to a narrow duftetepddd. and beutg provided with 25 to provide for supporting the threadcutting del a notch Ii substantially intermediate its ends and withlongitudinally disposed teeth I2 on its'outer vice when cutting threadson plpes of large Size side relative toits positionwhen'in one of the toprovide for holding the thread-cutting device Slots 1 V in alignmentwith the pipe for facfdtatmg the i3 designates a ring which ispreferably'of split 30 starting of the thread on said pipe, to providetype and arranged to beapplied to the mandrel for increasing the Powernorma-uy applied to the member 4 for seating in an'annular .groove l I4in I thread'cuttmg devl during threadmg opera" the member 4 andin the'notches lIi of the `clamptions; and to provide dnproved elements andar' ing inserts 8 to normally retain .the inserts rangements ofelementsin a threading device of .against displacement fiom the ,slots 1in the this character. Y y member 85 In accomplishing these and otherObjects 0f vThe internal bore i5 of the mandrelmember 3 the presentinvention, we have Yprovided improved is preferably of uniform diameter,and the indetails 0f Structure the Preferred forms 'of whichAternal'b'ore yof -the mandrel member 4 corresponds are illustrated inthe accompanying drawings' 'in size Vto the bore i5 to a point'lspacedouto Whefein Wardly Yfrom the threaded boss 5 at the inner end F18- 1 is9 Perspective View 0f a threading. de* of the mandrel member 4 from.which point it vice embodyingtheV features 0f 0111' preferred tapersedtwerdw as indicated at l1, and termi-A fOl'm 0f inventifmnatesin awide opening I8 relative to theopen- Fig. 2 is a vertical longitudinalSection throughA ing to the bore at' the inner endofthe mandrel 45 thethreading device illustratedin Fig. l showing member 4, if y 1 o Y I thedevice pliOI t0 clamping the Same t0 a Pipe With the arrangementillustrated, the mandrel tobe threaded. Y members are adaptedto-slidably receive a cam Fig. 3 is a section similar to Fig. 2vshowingthe Vshaft I9 provided with a tapered cam 20 at one device secured to apipe'and illustrating the manendV thereof engageable in the tapered boreI1 y50 ner 0f Chasing threads 011 the Dipeof the mandrel member 4, thecam member 20 Fig. 4 is a transverse irregular section through beinglarranged to force the clamping inserts 8 0111' improved threadingdevice 0n the 11,11 4 4, outwardly relative to the slots'in which theyseat Fig. 2. when the cam member is moved to the right, as

l. I flg. 5 is a vertical cross-section througli the in against tensionof the ring I3; 55

It is desirable to normally retain the clamping inserts in retractedcondition in their seating slots, and to this end. a danze 2| issuitablyprovided on the outer end of the cam 23 which forms a seat for one endof a coil spring 22, the other.

end of which seats against a shoulder 23 at the outer end of the mandrelmember 4, thus normal- 1y tendingto movethe cam 2l out of the bore' I1of the mandrelmember 4 to allow the' ring i3'V toretain the inserts inretracted condition.

Since the mandrel member 4 is removably mounted onthe mandrel member 3,it is iaipl'zbarentv that different mandrel members varying in size withrespect to their outsidediameters may beY applied to the members in'sucha manner'as to snugly engage within different sizes of pipes.

In order to effect clamping engagement of the mandrel with a pipe, theend 24 of the camshaft l5 is preferably mounted on a togglev block 25-which is pivotally mountedbetween the arms of a lever yoke 21. the leveryoke having an actuating handlellor thev like attached thereto foractuating the lever. The toggle block 25 is spaced inwardlyrelativetathecamends 2l of the lever yoke arms 23 in such a manner thatwhen the' longer arcuate edges of -the cam armsjt are in engagement withthe outerend of the mandrel member. .3, .thevcamshaftil is urged totheleft,.

as in Fig. 2, under tension of the spring 22 on the tapered camv23 ofthe shaft IQ. Whemhowever,

thelever handle 2,5. is moved for 4example from n the pomtion shown inFig. 2 to the position shown 'fin"I"ig. 3, the shorter arcuate edges ofthe'cam arms 25 ride into engagementwith theouterend'l oi the-mandrelmember-3 and move .the-toggle tion I1 to move the lclamping inserts. Ioutward- .-engagementof the vteeth I2 on theinserts'in biting relationto the innersurfaceof a pipe-,3i in which the mandrel member 4 has been4placed.,

the mandrel as -a whole thus being securely y clamped and locked indesired vposition relative to the pipellwhichi tobe threaded.-

n designates o .die of any suitable 'character adaptedeto chasethreadsof desired vsize on the .pipe 3|, the die 32 vbeing mounted in-af suitable support. which, in turn is supported by ya member 34rotatably mounted on the mandrel;

the-member 5.4 preferably being in'the form of a e housing to which thesupportn'minxed'os by fastening devices 35. In order torrotate the die32to in the pipe 3l, it is necessary to rotate the memi ber 34 on themandrel.. A convenient arrange'- .ment for so rotating the member 34 isprovided by this invention whereinthe inner 4surfer-.e of the housing isprovided with aninternalgear 35. The die .supporting face vI'l of thehousing member 34, hereinafterreferred to .as the iront face thereof,and the opposite` or rear face 33 of the housing are provided withopenings 3l and. 4l respectively; the bounding edgesoi the openl ing 35being slidably engageable with the mandrel. A'sungear 4i rotatable intheopening 4I is rotatably mounted on the mandrel member 3, the sun gearbeing provided with a series of long teeth 42 at one endthereof andaseries of short teeth 43 .on the-other end thereof.

44 designates a housing bracket mounted on the mandrel member 3 inVsurrounding `relation to the outer end of the sun gear 4 I whichbracket ,threads animare supportsfa driving member 45. such as anelectric or like motor, having a drive shaft 45 provided with a pinion41 operatively engaged with the teeth 42 of the sun gear 4-i, the pinion41 normally engaging the teeth 42 of the sun gear adjacent the innerends of the teeth, as illustrated in Fig. 2.

`The force from the'motor driven pinion is preferably transmitted, torotate the housing 34 and"chase'the'threads in the pipe 3i, by theprovision of a spider 48 keyed, as at 4l, adjacent the threaded end ofthe mandrel member 3. The spider 48 preferably comprises arms extendingAlaterally of the mandrel member 3, which arms are each provided withbearing bosses 55 and 5|,

Fig. 2, having shafts 52 and 53 rotatably mounted therein. The shaftshave planetary gears 54 and 55 thereon respectively, the planetary gears54 meshing with the short teeth 43 of the sun gear 4|. and with theteeth of the planetary gears 55.

' 'The teeth `of the planetary gears 55 also mesh .with the 'teeth 4ofthe internal gear 35 in the housing member 34, it thus being apparentthat when the motor 45 is actuated its power is transmitted through thepinion n through the un ,gear 4I end from the sun gear 4I through theplanetary gears 54 and 55 to the internal gear 35` of the housing torotate the housing and turn the die 32 to chase in-the pipe.

While sun and planetary gears have been illustrated Vfor transmittingmotive power to chase teeth in a pipe,` such illustrationis by way ofexample, it being apparent that beveled gears -or other suitable gearreduction mechanisms for increasing 'the' motive power ultimatelyapplied to the thread-mung `die may be'providod without'departingfromthe spirit of the present invention.

f i In order to urge the die 22 into thread-chasing engagement withl thepipe, springs 55 are preferably mounted on the ends of the shafts 52opposite the-planetary gears 54,the ends of which springsbear againstthe inner face 51 of the housing face 31 and against the arms of thespider 45.- Since the spider is keyed to the mandrel and since thehousing is rotatably and slidablymounted on vthe mandrel, the springstend to move the housingto the left, as shown in Figs. 2 and 3, thusmaintaining the die in threadchasing contactwith the pipe.

Where large pipe is to be threaded, it has r been 4found desirable toadditionally support the thread-cutting device and to this end, anannular groove `55 is provided in the housing member 34 for rotatablymounting a yoke 55 therein. Trunynlons 50 land 6i are mountedin the yoke5l,

preferably in oppositely disposed relation to each other,:whic'htrunnions may be employed both for engagement with suitable suspendingtackle. not shown, and for manual engagement to aid in `urging thehousing toward the pipe and the die longitudinally along the pipe whenin cutting relation thereto.

The operationof a threading device constructed as described is afollows:

. memberI 34, the housing member is moved to the left to compress thespider springs 55 and cause the die to engage the end of the pipe asillustrated in Fig. 2. The lever member, which is cam'faces of the leveryoke arms at that time' normally in the position shown in Fig. 2, is`then actuated to draw the cam shaft to the right, as

in Figs. 2 and-3, to cause the cam 20 in the man-V drel member 4 toforce the clamping inserts outwardly into biting orf clamping engagementwith the inner surface of the pipe, the short arcuate engaging the outerend ofthe mandrel 3 to `hold thelever in dead-center position and thusmaintain the clamping action of the clamping inserts on the pipe.

The '.motor is then actuated, theA power from Y which is transmittedthrough the drive shaft 46, pinion 41, and sun gear 4I to the planetary.gears 54, and from the planetary gears 54 bear against the spider andinherently force the housing toward the pipe to'maintain the die inthread-chasingY contact with the pipe.

It is apparent that the motor is effective in driving the die throughoutits thread chasing action by reason of the motor pinion riding outwardlyalong the teeth of vthe sun gear 4i, thus allowingthe housing to moveaway from the motor during rotation and thread-'cutting Kaction ofthedie.

When suitable threads have been chased in the pipe, the motor isstopped; the direction of rotation of the housing is then reversed orothersuitable means used to remove the die from thepipe, and the camlever is moved fromits dead-center position illustrated in Fig. 3 toallow the spring 22 on the cam shaft to Withdraw the cam 20 from ventionis' illustrated, wherein the mandrel B5 and housing member 66 aresubstantially similar to that of the preferred form of the invention, amanually operated driving member 61 being provided yin the modied formof invention which preferably consists of a hand wheel keyed to the sungear 68 as shown at 69 and retained againstlongitudinal displacementA asby a set screw 10.

The operation of the modified form of invention is substantially similarto that of the preferred form, the difference being that the hand wheelmay be manually turned to rotate the sun gear, the planetary gears 1|connected therewithv as well as the planetary gears 12 and internal gear'I3 in thehousing respectively to rotate the housing and drive the die32.

It is apparent, therefore, that a pipe threading device has beenprovided by the present invention which avoids the necessity formounting a pipe Ato be threaded in a vise 'or similar support and whichthus makes the device available for use in the eld or at any place atwhich it is necv essary to provide threads on pipes of different sizes.

What we claim and desire to vsecure by Letters Patent is:

i. In a device of the character described, a mandrel member having aboretherethrough and having spaced slots therein communicating with thebore, clamping members mounted in said slots. means in said boreengageable with said clamping` members to urge the same outwardly insaid slots into engagement with the inner surface Vof a pipe into whichthe mandrel memberis inserted, means engaged withsaid urging meansv to Yeffect movement thereof toward said clamping members to` lock theclamping members in pipe engagingv position, a die member rotatablymounted onsaid mandrel member,A and means for rotating said die memberto chase threads on said pipe.

2. In a device of the character described, a mandrel member having abore therethrough, a lmandrel member removably mounted onV theflrstfnamed mandrel member having a bore therethrough and having spacedslots therein communicating with the bore, clamping members mounted insaid slots, a cam member in 'said bores engageable with said clampingmembers to Vurgethe same outwardly in said slots' into engagement withthe inner surface of av pipe into which the second-named' mandrel memberis ingserted, a cammed-lever engaged with said cam member to effectmovement thereof toward. said clamping members to, lock theclampingmembers in pipe engagingposition, a die member rotatably mounted on saidmandrelV members, and means for rotating said die member* tocha'sethreads on said pipe.

3. In a device of the character described, a mandrel member having abore therethrough and having spaced slots therein communicatingwith the'bore, clamping members mounted in said slots, -a cam member in saidbore engageable `with`said clamping members to urge the same outwardlyin said slots into engagement with the inner surface of a pipe into.which the mandrel member is inserted, means engaged with said cammember to effect movement thereoftoward said clamping members to lockthe clamping members in pipe engaging position, a die member rotatablymounted on said 'mandrel member, means for rotating said 4die member tochase threads on said pipe, and meansnormally urging said cam member outof engagement with said clamping members.

4. .In a device of the character described, a

mandrel member 'having a bore therethrough, a mandrel member removablymounted on the `first-named mandrel member having a bore therethrough'and having spaced slots' therein urge the same outwardly in said slotsinto` en` gagement with the inner surface of a pipe into whichV thesecond-named mandrel member is inserted, a cammed lever engaged withsaid cam member to effect movement thereof toward said clamping membersto lock the clamping members in pipe engaging position, a die memberrotatably mounted on said mandrel members,` means for rotating said diemember to chase threads on said pipe, and means normally -urging saidcam member out of engagement with said clamping members.

5. In a device of the character described, a mandrel member having aboretherethrough and having spaced slots therein communicating with thebore, clamping members mounted `in said. slots, means in said boreengageable with. said clamping members to urge the same outwardly insaid slots into engagement 'with the inner surface of a pipe into whichthe mandrel member is inserted, means engaged with saidurging meanstoeffect movement thereof toward said clamping members to lock theclamping members in pipe engaging position, a die member rotatablymounted on said mandrel member, means for rotating said die member tochase threads on said pipe, and means normally retaining the clampingmembers in retracted condition relative to said slots.

. f3. In a device of the character described, a.l

mandrel, means on the mandrelV engageable within a pipe upon whichthreads are to be chased, a housing rotatably mounted on the mandrel, athread cutting die on the housing engageable with the pipe, means torotate the housing and die for chasing threads on said pipe, and meansnormally urging the housing and die in the direction of said pipe.

7. In a device of the character described, a. mandrel engageable withina pipe upon which threads are4 to be chased, means for clamping saidmandrel in said pipe, a sun gear rotatably mounted on said mandrel,a'spider ilxed to said mandrel, planetary gears mounted on said spiderenmeshed with the sun gear, a housing rotatably mounted on the mandrelhaving an internal gear meshed with said planetary gears, said sun gearextending exteriorly of the housing, means enwith the sun gear forrotatingthe same, and a die mounted on said housing and engageable withthe pipe to cut threads therein in re-V s. ed on said mandrel, a spiderfixed to said mandrel, planetary gears mounted on said spider enmeshedwith the sun gears, a housing rotatably mounted on the mandrel having aninternal gear meshed with said planetary gears, a die mounted on saidhousing and engageable with the pipe to cut threads therein, and meansnormally urging the housing and die in the direction of said pipe.

9. In a device of the character described, a mandrel engageable Within apipe upon which threads are to be chased, means for clamping saidmandrel in said pipe, a sun gear rotatably mounted on said mandrel, aspider xed to said mandrel, planetary gears mounted on said spiderenrneshed with the sun gear, a housing rotatably mounted on the mandrelhaving an internal gear meshed with said planetarygears, a die mountedon said housing and engageable with the pipe to cut threads therein,means normally urging the housing and die in the direction oi' saidpipe, and means mounted on the mandrel in engagement with said sun gearexteriorly of the housing for actuating the sun gear to rotate 'the die.

10. In a device of the character described, a mandrel, means on themandrel engageable within a pipe upon which threads are to be chased, ahousing rotatably mounted on thevmandrel, a thread cutting die on thehousing engageable with the pipe, means to rotate the housing and diefor chasing threads on said pipe, and means rotatably mounted on thehousing for suspending the same and facilitating urging the die in thedirection of the pipe.

' 11. In a device of the character described, a mandrel engageable in apipe and having a longitudinally arranged slot, a die rotatably mountedon the mandrel and engageable with the outer surface of the pipe, amember slidablymounted in said mandrel slot for clamping the mandrel tothe pipe, means for rotating said die to chase threads in the pipe, anda spring mounted on the mandrel in engagement with said member normallyurging the clamping member of the mandrel out of engagement with thepipe.

12. In a device of the character described, a mandrel, means on themandrel engageable with the interior of a pipe to anchor the mandrel tothe pipe, a die rotatably mounted on the mandrel and engageable withsaid pipe in thread cutting relation thereto, and a motor supported bysaid mandrei and operatively connected with the die for rotating thesame to chase threads in said pipe.

13. In a device of the character described, a mandrel, means on themandrel engageable within a pipe upon which threads are to be chased, ahousing mounted on the mandrel, a rotatable die supported by the housingand engageable with the pipe in thread cutting relation thereto, meansto rotate the die for chasing threads on said pipe, and means for urgingthe die in the direction of said pipe.

JAMES P. BIRD. FRED B. SCHAFFER.

